Sage is not a pinnacle of great design. It has a few dps cd's, but you'll largely be spamming one button. It's toolkit isn't new and innovative, it's gauge heals are variations of SCH's aether heals, even down to having the same cooldown. It has the usual medica and cure I clone along with some cooldowns that are essentially Whispering dawn and Fey Blessing clones. It's heal buff is like a targeted fairy embrace.
Sage is not a major improvement on heal design, it's a tiny step in the right direction and an improvement on SCH but that's about it. Look forward to another expansion of 1, 1, 1, 1, 1.